docs/evolve-faq.rst
author Pierre-Yves David <pierre-yves.david@fb.com>
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.. Copyright 2011 Pierre-Yves David <pierre-yves.david@ens-lyon.org>
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..                Logilab SA        <contact@logilab.fr>
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---------------------------------------------------------------------
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Evolve How To
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---------------------------------------------------------------------
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Add a changeset: ``commit``
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Just use commit as usual. New changesets will be in the `draft` phase.
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Rewrite a changeset: ``commit --amend``
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------------------------------------------------------------
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It writes a new changeset combining working-directory parent changes and parent.
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It will work on any `draft` or `secret` changeset. It will not work on `public`
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changesets.
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To understand what the result of amend will be I use the two following
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aliases   [#]_::
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    # diff what amend will look like
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    pdiff=diff --rev .^
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    # status what amend will look like
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    pstatus=status --rev .^
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This command can even be invoked on changesets with children, provided
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none are public.
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.. [#] (defined by the evolve extension for you)
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Move a changeset: ``grab``
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You can use ``hg grab <rev>`` to move a rev at your current location, making the
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old version obsolete.
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.. note:: grab is an alias for ``hg rebase --dest . --rev $@; hg up <result>``
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Delete a changeset: ``prune``
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A new ``prune`` command allows removing a changeset.
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Just use ``hg prune <some-rev>``.
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Moving within the history: ``gdown`` and ``gup``
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While working on mutable part of the history you often need to move between
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mutable commits.
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You just need to use standard update to work with evolve. For convenience, you
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can use ``hg gup`` to move to the child commit or ``hg gdown`` to move to the parent commit.
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Those command have ``previous`` and ``next`` alias.
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.. note:: Those commands only exist for the convenience of getting qpush and qpop
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          feeling back.
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Collapse changesets: ``fold``
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You can use ``hg fold`` to collapse multiple changesets in a single one.
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It takes two forms:
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``hg fold <rev>`` folds everything from you current changeset to `<rev>`
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``hg fold -r <revset>`` fold everything changeset matching the revset together.
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Getting changes out of a commit
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------------------------------------------------------------
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The ``hg uncommit`` command lets you rewrite the parent commit without
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selected changed files. Target files content is not altered and
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appears again as "modified"::
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  $ hg st
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  M babar
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  M celestine
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  $ hg commit babar celestine
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  $ hg st
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  $ hg uncommit celestine
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  $ hg status
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  M celestine
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Split a changeset
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-----------------------
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To split on file boundaries, just use ``uncommit`` command.
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If you need a fine-grained split, there is no official command for that yet.
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However, it is easily achieved by manual operation::
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  ### you want to split changeset A: 42
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  # update to A parent
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  $ hg up 42^
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  # restore content from A
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  $ hg revert -r 42 --all
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  # partially commit the first part
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  $ hg record
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  # commit the second part
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  $ hg commit
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  # informs mercurial of what appened
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  # current changeset (.) and previous one (.^) replace A (42)
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  $ hg prune --new . --new .^ 42
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For more complexe scenario we recommend the use of the histedit_ extension.
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.. _histedit: http://mercurial.selenic.com/wiki/HisteditExtension
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Update my current work in progress after a pull
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----------------------------------------------
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Whenever you are working on some changesets, it is more likely that a pull
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will, eventually, import new changesets in your tree.
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And it is likely that you will want your work in progress changesets to be
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rebased on the top of this newly imported subtree.
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Doing so is only a matter of rebasing.
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Move multiple changesets: ``rebase``
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You can still use rebase to move a whole segment of the changeset graph together.
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.. warning:: Beware that rebasing changesets already obsolete will likely result in
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             divergent versions of the changesets.
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Resolve history troubles: ``evolve``
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When you rewrite (amend) a changeset with children without rewriting
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those children you create *unstable* changesets and *suspended
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obsolete* changesets.
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When you are finished amending a given changeset, you will want to
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declare it stable, in other words rebase its former descendants on its
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newest version. This is not done automatically to avoid the
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proliferation of useless hidden changesets.
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Fix my history afterward: ``prune -n``
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Sometimes you need to create an obsolete marker by hand. This may happen when
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upstream has applied some of your patches for example.
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you can use ``hg prune --new <new-changeset> <old-changeset>`` to add obsolete
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marker.
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Export to mq: ``synchronize``
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Another extension allows to export your changes to mq.
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View diff from the last amend
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An ``odiff`` alias have been added by ``enable.sh``
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:: 
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    [alias]
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    odiff = diff --rev 'limit(precursors(.),1)' --rev .
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View obsolete markers
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hgview_ is the only viewer that currently supports this feature. You
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need version 1.6.2
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.. _hgview: http://www.logilab.org/project/hgview/
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.. image:: figures/hgview-example.png
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    :scale: 50%
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You can also use a debug command
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    $ hg debugobsolete
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      5eb72dbe0cb4 e8db4aa611f6
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      c4cbebac3751 4f1c269eab68
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Important Note
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=====================================================================
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View change to your file
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Extinct changesets are hidden using the *hidden* feature of mercurial.
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Only ``hg log``, ``hg glog`` and ``hgview`` support it, other
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graphical viewer do not.
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